EFKA FP220A5911
52
11.3.3 Stitch Correction and Speed Release
Function
with
or
without
control panel
Parameter
Stitch correction time
(t8)
150
Delay until speed release after start backtack
(t1)
200
Speed release after single and double backtack can be influenced by parameter 200.
In the case of slow backtack mechanisms it is possible to delay disabling of the stitch regulator in the single and double
start backtack by the time t8 (start backtack stitch correction) and thereby prolong the backward section. This time-lag can
be selected by means of parameter 150.
11.3.4 Double Start Backtack
The forward section will be sewn for a number of stitches that can be set. Then the stitch regulator signal will be issued and
the backward section will be executed. The number of stitches for the two sections can be set separately.
11.3.5 Single Start Backtack / Start Stitch Condensing
The stitch regulator signal will be issued and the backward section and/or start stitch condensing will be executed for a
number of stitches that can be set.
11.4 End Backtack / End Stitch Condensing
Function
without
control panel
Control
Single end backtack
LED 3 On
S3 key
Double end backtack
LED 4 On
End backtack Off
both LEDs Off
End stitch condensing On; number of stitches with stitch regulator
LED 3 On
S3 key
(parameter 002)
End stitch condensing On; number of stitches with stitch regulator
LED 4 On
(parameter 002), after that number of stitches without stitch
regulator (parameter 003)
End stitch condensing Off
both LEDs Off
Function
with
control panel
V810
V820
Single end backtack
lefthand arrow above key On
2 key
4 key
Double end backtack
righthand arrow above key On
End backtack Off
both arrows Off
End stitch condensing On; number of stitches with stitch
lefthand arrow above key On
2 key
4 key
regulator (parameter 002)
End stitch condensing On; number of stitches with stitch
righthand arrow above key On
regulator (parameter 002) , after that number of stitches
without stitch regulator (parameter 003)
End stitch condensing Off
both arrows Off
The end backtack/end stitch condensing in a seam with stitch counting starts by heelback at the end of counting, or, from
the light barrier seam at the end of the light barrier compensating stitches. The stitch regulator is immediately enabled from
machine standstill. After lowering the sewing foot, the switch-on point of the stitch regulator is delayed by the time t3 (start
delay after switching off the sewing foot lift signal). The first leading edge of position 1 counts as 0 stitch whenever the
function is not started in position 1. If backtack synchronization (parameter 298) is not switched on, the stitch regulator is
synchronized to position 1.
End backtack as well as end stitch condensing are performed automatically at speed n4. They cannot be interrupted.
From full machine run, end backtack / end stitch condensing will be switched in only after having reached the speed n4 and
synchronization to position 2.
